IOS/USB_KBD: Add static assertion to enforce MessageData as trivially copyable

MessageData must be a trivially copyable type, given it's copied into
emulated memory via our memory copy function CopyToEmu. Under the
covers, this function utilizes memcpy. One of memcpy's requirements is
that pointers to it point to types that are trivially copyable,
otherwise the behavior is undefined.

Given that, we can enforce this requirement at compile-time.

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